下列化合物氢化热最低的是（）。
A.1，3-戊二烯
B.1，4-戊二烯
C.1，3-丁二烯
参考答案：C
用所给单词的适当形式填空。
1. This department store _________ (have) shoes, clothes, toys, books and _________ (bicycle).
2. Let's go to the movie theatre to _________ (watch) a movie.
3. The weather is _________ (wind) and _________ (cloud).
4. Tom _________ (go) to the city.
服务标准化的形式主要有哪3种？
